
*{
    margin: 0;
    padding: 0;
    list-style: none;
    box-sizing: border-box;
}
html,body , .box{
    width: 100%;
    height: 100%;
}
header{
    width: 100%;
    height: 45px;
    border-bottom: 1px solid #ccc;
    text-align: center;
    line-height: 45px;
}
nav{
    height: 40px;
    display: flex;
    justify-content: space-around;
    align-items: center;
    border-bottom: 1px solid #ccc;
}

main{
    width: 100%;
    /* calc 是css的函数, 用来计算数值的 */
    height: calc(100% - 85px);
    background-color: rgba(160, 160, 160, 0.2);
    overflow: hidden;
}

.item{
    margin-top: 10px;
    width: 100%;
    height: 100px;
    background-color: #fff;
    display: flex;
    justify-content: space-around;
    align-items: center;
}
.item>img{
    width: 60px;
    height: 60px;
}
.item>div{
    height: 80%;
    font-size: 13px;
}
.msg{
    width: 200px;
}
.right{
    width: 100px;
}
.msg p{
    margin-top: 5px;
}
.right p{
    text-align: center;
    margin-top: 6px;
}
